In short, no. The SHORTTAG feature (Clause 13.5.1) combines several kinds of
name and delimiter omission.
Craig's question was indeed asked during the development of ISO 8879; the
current conformance clause is the result of compromises (among other things)
to reduce the number of confomance options in the standard (and thus the
number of possible combinations of options: we had seen other standards, which
shall remain unnamed, with polydimensional matrices of conformance classes
that resulted in products that were in conformance with the standard
nonetheless being unable to interchange documents.)
Jim Mason
Dr. James D. Mason
(ISO/IEC JTC1/SC18/WG8 Convenor)
Oak Ridge National Laboratory
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Network: masonjd @ ornl.gov